Let me know what you think

If you're only making sigs, it doesn't matter.
Unless you're going to do some industry level art that requires a lot of rendering and processing power, it does not matter.

i voted PC because like stated above unless you are an industry professional or plan to be there is really no reason for the horrendous price increase....especially when it comes to a desktop... if however you were looking for a laptop id definitely recommend a mac book pro.

Confirmed -

Mac for pro design - much quicker and less if NO bugs at all
Pc for basic design - and it crash a lot and slow as hell for 11' x 11' and higher poster